In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing th...In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing the PWM and sensing strategy directly and needn't the motor neutral point voltage information. The paper analyzes both the steady-state of PWM on the high side modulator mode which doesn't consider the parasitic capacitance Coes in the switches and the transient-state of PWM on the high side modulator mode which considers the parasitic capacitance Coes in the switches in detail. The experimental results verify that the proposed method is not sensitive to switching noise,no filtering is required,and good motor performance is achieved within a wide speed range.展开更多
The magnhc network model of a hybrid step motor is established by the air gap rate permeance method,and the expression of harmonic back EMF is deduced, and from the analysis above, a vovel use of harmonic backEMF sed ...The magnhc network model of a hybrid step motor is established by the air gap rate permeance method,and the expression of harmonic back EMF is deduced, and from the analysis above, a vovel use of harmonic backEMF sed to extract rotor peition is proposed and a new position sensor integral with the motoris designed .Experi-ments verified the correctness of the theorecal analysis. Ths type of rotor position sensor lays a foundation for closed-loop conrol of step motor.展开更多
提出一种改进型反电动势谐波自适应补偿的PMSG无位置传感器控制方法,该方法在滑模观测器SMO(sliding model observer)的基础上引入自适应广义二阶积分器SOGI(second order generalized integrator),减小了反电动势观测中谐波对转子位置...提出一种改进型反电动势谐波自适应补偿的PMSG无位置传感器控制方法,该方法在滑模观测器SMO(sliding model observer)的基础上引入自适应广义二阶积分器SOGI(second order generalized integrator),减小了反电动势观测中谐波对转子位置的影响,提高了转子位置估计的准确性。由于电机参数的变化和变换器的非线性,在无位置传感器控制算法中含有大量的5、7、11次等低次谐波。使用自适应SOGI取代低通滤波器,对基频信号进行提取,一方面减小了低频谐波含量,从而减小了由低频谐波引起的转子位置估计偏差,同时消除了由滤波延时引起的相位偏差;另一方面提高了系统的跟踪性能,使得相位误差收敛于0。最后,通过仿真和实验验证了所提方法的正确性和可行性。展开更多
采用转矩环取代传统的电流环,可减小非理想反电势无刷直流电机(brushless DC motor,BLDCM)的转矩脉动,提高其控制性能,而转矩环中反馈转矩计算的关键在于绕组反电势的准确获取。建立考虑参数偏差的滑模观测器(sliding-mode observer,SMO...采用转矩环取代传统的电流环,可减小非理想反电势无刷直流电机(brushless DC motor,BLDCM)的转矩脉动,提高其控制性能,而转矩环中反馈转矩计算的关键在于绕组反电势的准确获取。建立考虑参数偏差的滑模观测器(sliding-mode observer,SMO)对反电势进行实时观测,定量分析了定子电阻偏差对观测结果的影响,分析表明反电势观测的稳态误差等于电阻偏差量与电流的乘积。为消除这一影响,利用李雅普诺夫(Lyapunov)稳定性理论,设计了定子电阻参数辨识的自适应率,在线辨识得到的电阻参数用于调整SMO的系数矩阵,构成了新型的自适应滑模观测器。最后,利用RT-LAB实时控制器进行实验,验证了上述分析结果的正确性,证明了所提方法能够正确快速地观测无刷直流电机反电势。展开更多
基金Sponsored by the National High Technology Research and Development Program of China( 863 Program) ( Grant No. 2007AA09Z214)
文摘In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing the PWM and sensing strategy directly and needn't the motor neutral point voltage information. The paper analyzes both the steady-state of PWM on the high side modulator mode which doesn't consider the parasitic capacitance Coes in the switches and the transient-state of PWM on the high side modulator mode which considers the parasitic capacitance Coes in the switches in detail. The experimental results verify that the proposed method is not sensitive to switching noise,no filtering is required,and good motor performance is achieved within a wide speed range.
文摘The magnhc network model of a hybrid step motor is established by the air gap rate permeance method,and the expression of harmonic back EMF is deduced, and from the analysis above, a vovel use of harmonic backEMF sed to extract rotor peition is proposed and a new position sensor integral with the motoris designed .Experi-ments verified the correctness of the theorecal analysis. Ths type of rotor position sensor lays a foundation for closed-loop conrol of step motor.
文摘提出一种改进型反电动势谐波自适应补偿的PMSG无位置传感器控制方法,该方法在滑模观测器SMO(sliding model observer)的基础上引入自适应广义二阶积分器SOGI(second order generalized integrator),减小了反电动势观测中谐波对转子位置的影响,提高了转子位置估计的准确性。由于电机参数的变化和变换器的非线性,在无位置传感器控制算法中含有大量的5、7、11次等低次谐波。使用自适应SOGI取代低通滤波器,对基频信号进行提取,一方面减小了低频谐波含量,从而减小了由低频谐波引起的转子位置估计偏差,同时消除了由滤波延时引起的相位偏差;另一方面提高了系统的跟踪性能,使得相位误差收敛于0。最后,通过仿真和实验验证了所提方法的正确性和可行性。
文摘采用转矩环取代传统的电流环,可减小非理想反电势无刷直流电机(brushless DC motor,BLDCM)的转矩脉动,提高其控制性能,而转矩环中反馈转矩计算的关键在于绕组反电势的准确获取。建立考虑参数偏差的滑模观测器(sliding-mode observer,SMO)对反电势进行实时观测,定量分析了定子电阻偏差对观测结果的影响,分析表明反电势观测的稳态误差等于电阻偏差量与电流的乘积。为消除这一影响,利用李雅普诺夫(Lyapunov)稳定性理论,设计了定子电阻参数辨识的自适应率,在线辨识得到的电阻参数用于调整SMO的系数矩阵,构成了新型的自适应滑模观测器。最后,利用RT-LAB实时控制器进行实验,验证了上述分析结果的正确性,证明了所提方法能够正确快速地观测无刷直流电机反电势。
